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Promise deferred
function getSomeJSON(url, callback) {
// AJAX call to get data from server. Accepts callback and calls
// with callback(err, response)
...
}
function fetchJSON(url) {
var deferred = new Deferred();
getSomeJSON(url, function (err, response) {
if (err) return deferred.reject(err);
deferred.resolve(response);
});
return deferred.promise;
}
fetchJSON("http://www.google.com").then(..);
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